Do S na Seitokaichou-sama ga M Note ni Shihai Saremashita.

In the hallowed halls of a seemingly ordinary high school, the student body is ruled with an iron fist by a beautiful, yet notoriously sadistic, student council president. Her every command is absolute, her punishments legendary, and no one dares to question her authority — until an unexpected item falls into the hands of a seemingly insignificant student. Now, with a mysterious "M Note" that grants its wielder an unprecedented power over the formidable president, the school's rigid hierarchy is about to be turned on its head. Will this newfound ability be used for liberation, revenge, or something far more… complicated? Prepare for a steamy, power-shifting dynamic where control is the ultimate prize.

✦ AI-drafted summary